Backpack



FIG. 1 is a right-front perspective view of the backpack;

FIG. 2 is a rear view of the backpack shown in FIG. 1;

FIG. 3 is a front view of the backpack shown in FIG. 1;

FIG. 4 is a right-side view of the backpack shown in FIG. 1;

FIG. 5 is a left-side view of the backpack shown in FIG. 1;

FIG. 6 is a top view of the backpack shown in FIG. 1; and,

FIG. 7 is a bottom view of the backpack shown in FIG. 1.

The subject matter shown in dashed lines, and any surfaces of the design not shown, including interior surfaces, form no part of the claimed invention. 

CLAIM The ornamental design for a backpack, as shown and described. 